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------~--------3-o_v
__
E_xc_it_e_r_T_rig_g_er ________
+-------
5
2
------~----------~R~ef~er~en~c~e
______
~---+-------
3
6
7
----...L.----
AC Mains Input
8
-----r-----
Mains Power
Connector Block
Power Amplifier
Type 2707
100,000
~-tF
+
30
v
T . . . .
_---t----
4
Mains Power
Connector Block
Exciter Body
Type
4801
27',0/6
Fig.3. 12.
Special connections
effectiveness of the Exciter Interlock protective
circuitry, the
displacement
capability and the available force.
Reduced mains voltage lowers the effectiveness of
the
exciter cooling, so
the current to the moving coil must be limited
to
prevent its overheating.
The amplifier CURRENT LIMIT control will provide this protection if
26
Current Limit/
Nominal Current Limit
%
100
80
60
40
20
0
~
..............
-
~
...-
k--"'
.... v-
0
10
20
30
40
50
60
70
80
90
100
110
Mains
Voltage/Nominal Mains Voltage
%
~
UP/'8
Fig.3.13.
CURRENT LIMIT v. Mains Voltage
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